1 /* Read NLM (NetWare Loadable Module) format executable files for GDB.
2 Copyright 1993, 1994, 1995, 1996, 1998, 1999, 2000
3 Free Software Foundation, Inc.
4 Written by Fred Fish at Cygnus Support (fnf@cygnus.com).
6 This file is part of GDB.
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2 of the License, or
11 (at your option) any later version.
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with this program; if not, write to the Free Software
20 Foundation, Inc., 59 Temple Place - Suite 330,
21 Boston, MA 02111-1307, USA. */
29 #include "stabsread.h"
31 extern void _initialize_nlmread (void);
33 static void nlm_new_init (struct objfile *);
35 static void nlm_symfile_init (struct objfile *);
37 static void nlm_symfile_read (struct objfile *, int);
39 static void nlm_symfile_finish (struct objfile *);
41 static void nlm_symtab_read (bfd *, CORE_ADDR, struct objfile *);
43 /* Initialize anything that needs initializing when a completely new symbol
44 file is specified (not just adding some symbols from another file, e.g. a
47 We reinitialize buildsym, since gdb will be able to read stabs from an NLM
48 file at some point in the near future. */
51 nlm_new_init (struct objfile *ignore)
53 stabsread_new_init ();
58 /* NLM specific initialization routine for reading symbols.
60 It is passed a pointer to a struct sym_fns which contains, among other
61 things, the BFD for the file whose symbols are being read, and a slot for
62 a pointer to "private data" which we can fill with goodies.
64 For now at least, we have nothing in particular to do, so this function is
68 nlm_symfile_init (struct objfile *ignore)
76 nlm_symtab_read -- read the symbol table of an NLM file
80 void nlm_symtab_read (bfd *abfd, CORE_ADDR addr,
81 struct objfile *objfile)
85 Given an open bfd, a base address to relocate symbols to, and a
86 flag that specifies whether or not this bfd is for an executable
87 or not (may be shared library for example), add all the global
88 function and data symbols to the minimal symbol table.
92 nlm_symtab_read (bfd *abfd, CORE_ADDR addr, struct objfile *objfile)
96 asymbol **symbol_table;
97 long number_of_symbols;
99 struct cleanup *back_to;
101 enum minimal_symbol_type ms_type;
103 storage_needed = bfd_get_symtab_upper_bound (abfd);
104 if (storage_needed < 0)
105 error ("Can't read symbols from %s: %s", bfd_get_filename (abfd),
106 bfd_errmsg (bfd_get_error ()));
107 if (storage_needed > 0)
109 symbol_table = (asymbol **) xmalloc (storage_needed);
110 back_to = make_cleanup (xfree, symbol_table);
111 number_of_symbols = bfd_canonicalize_symtab (abfd, symbol_table);
112 if (number_of_symbols < 0)
113 error ("Can't read symbols from %s: %s", bfd_get_filename (abfd),
114 bfd_errmsg (bfd_get_error ()));
116 for (i = 0; i < number_of_symbols; i++)
118 sym = symbol_table[i];
119 if ( /*sym -> flags & BSF_GLOBAL */ 1)
121 /* Bfd symbols are section relative. */
122 symaddr = sym->value + sym->section->vma;
123 /* Relocate all non-absolute symbols by base address. */
124 if (sym->section != &bfd_abs_section)
127 /* For non-absolute symbols, use the type of the section
128 they are relative to, to intuit text/data. BFD provides
129 no way of figuring this out for absolute symbols. */
130 if (sym->section->flags & SEC_CODE)
132 else if (sym->section->flags & SEC_DATA)
135 ms_type = mst_unknown;
137 prim_record_minimal_symbol (sym->name, symaddr, ms_type,
141 do_cleanups (back_to);
146 /* Scan and build partial symbols for a symbol file.
147 We have been initialized by a call to nlm_symfile_init, which
148 currently does nothing.
150 SECTION_OFFSETS is a set of offsets to apply to relocate the symbols
151 in each section. We simplify it down to a single offset for all
154 MAINLINE is true if we are reading the main symbol
155 table (as opposed to a shared lib or dynamically loaded file).
157 This function only does the minimum work necessary for letting the
158 user "name" things symbolically; it does not read the entire symtab.
159 Instead, it reads the external and static symbols and puts them in partial
160 symbol tables. When more extensive information is requested of a
161 file, the corresponding partial symbol table is mutated into a full
162 fledged symbol table by going back and reading the symbols
165 Note that NLM files have two sets of information that is potentially
166 useful for building gdb's minimal symbol table. The first is a list
167 of the publically exported symbols, and is currently used to build
168 bfd's canonical symbol table. The second is an optional native debugging
169 format which contains additional symbols (and possibly duplicates of
170 the publically exported symbols). The optional native debugging format
171 is not currently used. */
174 nlm_symfile_read (struct objfile *objfile, int mainline)
176 bfd *abfd = objfile->obfd;
177 struct cleanup *back_to;
179 struct symbol *mainsym;
181 init_minimal_symbol_collection ();
182 back_to = make_cleanup_discard_minimal_symbols ();
184 /* FIXME, should take a section_offsets param, not just an offset. */
186 offset = ANOFFSET (objfile->section_offsets, 0);
188 /* Process the NLM export records, which become the bfd's canonical symbol
191 nlm_symtab_read (abfd, offset, objfile);
193 stabsect_build_psymtabs (objfile, mainline, ".stab",
194 ".stabstr", ".text");
196 mainsym = lookup_symbol ("main", NULL, VAR_NAMESPACE, NULL, NULL);
199 && SYMBOL_CLASS (mainsym) == LOC_BLOCK)
201 objfile->ei.main_func_lowpc = BLOCK_START (SYMBOL_BLOCK_VALUE (mainsym));
202 objfile->ei.main_func_highpc = BLOCK_END (SYMBOL_BLOCK_VALUE (mainsym));
205 /* FIXME: We could locate and read the optional native debugging format
206 here and add the symbols to the minimal symbol table. */
208 /* Install any minimal symbols that have been collected as the current
209 minimal symbols for this objfile. */
211 install_minimal_symbols (objfile);
213 do_cleanups (back_to);
217 /* Perform any local cleanups required when we are done with a particular
218 objfile. I.E, we are in the process of discarding all symbol information
219 for an objfile, freeing up all memory held for it, and unlinking the
220 objfile struct from the global list of known objfiles. */
223 nlm_symfile_finish (struct objfile *objfile)
225 if (objfile->sym_private != NULL)
227 mfree (objfile->md, objfile->sym_private);
231 /* Register that we are able to handle NLM file format. */
233 static struct sym_fns nlm_sym_fns =
235 bfd_target_nlm_flavour,
236 nlm_new_init, /* sym_new_init: init anything gbl to entire symtab */
237 nlm_symfile_init, /* sym_init: read initial info, setup for sym_read() */
238 nlm_symfile_read, /* sym_read: read a symbol file into symtab */
239 nlm_symfile_finish, /* sym_finish: finished with file, cleanup */
240 default_symfile_offsets, /* sym_offsets: Translate ext. to int. relocation */
241 NULL /* next: pointer to next struct sym_fns */
245 _initialize_nlmread (void)
247 add_symtab_fns (&nlm_sym_fns);